clark from michigan. >> thank you, mr. chair. my question to the entire panel is how can the department of homeland security best judge in urban areas risk of an attack based on the assessment that it uses now? i represent metropolitan detroit. we have a large international airport hub. that airport was the destination of the plane that the christmas day bomber attempted to blow up. there is a strong likelihood that our region could be the target of another attack. now in addition to the likelihood of an attack, the department also needs to look at the consequences of an attack. metropolitan metropolitan detroit did not use that as an example. we have a large population center. we have a border that is water, that is also the busiest international border crossing in terms of trade in north america. we also have a large regional drinking water system. my concern is mini metro detroiters are at risk of being poisoned if a terrorist decides to dump a bunch of biological agents in the drinking water system. so essentially, the gao re